summaryrefslogtreecommitdiff
path: root/drivers/soc/ti/ti_sci_inta_msi.c
blob: 0eb9462f609ecf831939c4d0b2d56bea038d087d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments' K3 Interrupt Aggregator MSI bus
 *
 * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
 *	Lokesh Vutla <lokeshvutla@ti.com>
 */

#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/soc/ti/ti_sci_inta_msi.h>
#include <linux/soc/ti/ti_sci_protocol.h>

static void ti_sci_inta_msi_write_msg(struct irq_data *data,
				      struct msi_msg *msg)
{
	/* Nothing to do */
}

static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data,
					    struct msi_msg *msg)
{
	/* Nothing to do */
}

static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info)
{
	struct irq_chip *chip = info->chip;

	if (WARN_ON(!chip))
		return;

	chip->irq_request_resources = irq_chip_request_resources_parent;
	chip->irq_release_resources = irq_chip_release_resources_parent;
	chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg;
	chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg;
	chip->irq_set_type = irq_chip_set_type_parent;
	chip->irq_unmask = irq_chip_unmask_parent;
	chip->irq_mask = irq_chip_mask_parent;
	chip->irq_ack = irq_chip_ack_parent;
}

struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode,
						     struct msi_domain_info *info,
						     struct irq_domain *parent)
{
	struct irq_domain *domain;

	ti_sci_inta_msi_update_chip_ops(info);

	domain = msi_create_irq_domain(fwnode, info, parent);
	if (domain)
		irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI);

	return domain;
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain);

static void ti_sci_inta_msi_free_descs(struct device *dev)
{
	struct msi_desc *desc, *tmp;

	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
		list_del(&desc->list);
		free_msi_entry(desc);
	}
}

static int ti_sci_inta_msi_alloc_descs(struct device *dev,
				       struct ti_sci_resource *res)
{
	struct msi_desc *msi_desc;
	int set, i, count = 0;

	for (set = 0; set < res->sets; set++) {
		for (i = 0; i < res->desc[set].num; i++) {
			msi_desc = alloc_msi_entry(dev, 1, NULL);
			if (!msi_desc) {
				ti_sci_inta_msi_free_descs(dev);
				return -ENOMEM;
			}

			msi_desc->inta.dev_index = res->desc[set].start + i;
			INIT_LIST_HEAD(&msi_desc->list);
			list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
			count++;
		}
	}

	return count;
}

int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
				      struct ti_sci_resource *res)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct irq_domain *msi_domain;
	int ret, nvec;

	msi_domain = dev_get_msi_domain(dev);
	if (!msi_domain)
		return -EINVAL;

	if (pdev->id < 0)
		return -ENODEV;

	nvec = ti_sci_inta_msi_alloc_descs(dev, res);
	if (nvec <= 0)
		return nvec;

	ret = msi_domain_alloc_irqs(msi_domain, dev, nvec);
	if (ret) {
		dev_err(dev, "Failed to allocate IRQs %d\n", ret);
		goto cleanup;
	}

	return 0;

cleanup:
	ti_sci_inta_msi_free_descs(&pdev->dev);
	return ret;
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);

void ti_sci_inta_msi_domain_free_irqs(struct device *dev)
{
	msi_domain_free_irqs(dev->msi_domain, dev);
	ti_sci_inta_msi_free_descs(dev);
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_free_irqs);

unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 dev_index)
{
	struct msi_desc *desc;

	for_each_msi_entry(desc, dev)
		if (desc->inta.dev_index == dev_index)
			return desc->irq;

	return -ENODEV;
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_get_virq);